When the system upon which a transport entity is running fai

【名词&注释】

有效性(effectiveness)、肾结核(renal tuberculosis)、计时器(timer)、每一个(every single)、受影响、重新开始(restart)

[单选题]When the system upon which a transport entity is running fails and subsequently restarts,the(21) information of all active connections is lost. The affected connections become half-open, as the side that did not fail does not yet realize the problem.The still active side of a half-open connections can close the connection using a(22)timer. This timer measures the time the transport machine will continue to await an (23) of a transmitted segment after the segment has been retransmitted the maximum number of times.When the timer (24),the transport entity assumes that either the other transport entity or the intervening network has failed. As a result, the timer closes the connection, and signals an abnormal close to the TS user. In the event that a transport entity fails and quickly restarts, half-open connections can be terminated more quickly by the use of the RST segment, the failed side returns an RST i to every segment i that it receives. When the RST i reaches the other side, it must be checked for validity based on the (25) number i, as the RST could be in response to an old segment. If the reset is valid, the transport entity performs an abnormal termination.

A. A

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学习资料：

[单选题]下列肾结核的临床特点，不正确的是（）.

A. 原发病灶多在肺
B. 病理型肾结核常不出现症状
C. 最初是双肾同时受累
D. 全身症状一般很明显
E. 从病理型肾结核到临床型肾结核一般多达数年

[单选题]轨道必须按标准铺设。扣件必须齐全、牢固并与轨型相符，直线段2条钢轨顶面的高低差，以及曲线段外轨按设计加高后与内轨顶面的高低偏差，都不得大于5mm。轨枕间距偏差不得超过（）mm。

A. A、150mm
B. B、100mm
C. C、50mm

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